Not necessarily young. Other cultures have different ideas of what's age appropriate and Ive seen Middle Eastern men dress fairly colorfully at times, when they're being casual or "sporty."
The evil eye charm is seen throughout the Middle East, not just Turkey. You see it in just about every country, including Israel. It's a charm against the evil eye and is used all around the Mediterranean. You'd also see it used in Gypsy culture.
The 2nd body that they found isn't really all that close to the first one. It's 2 miles away, but more importantly it's on the other side not just of I-95 but also Route 1. The first body was found in an area that's by the old Lorton prison grounds, most of which has been converted into parkland, and would be deserted at night. The 2nd body was found in an area that goes into neighborhoods closer to the Potomac River.
It wouldn't surprise me if the 1st body was a hit and run - his body was found not too far from where Furnace Road branches off of Lorton Road. I see people bicycle along Lorton Road all the time, and it's narrow and winding. There are narrow, deep ditches along either side. It wouldn't be hard to get winged by someone on either road, and stagger a bit only to die. Then again, yeah it could be a dump job but why wouldn't they go a little deeper into the woods?